Malicious PDF — malware analysis report

Static analysis result for SHA-256 180981d1c2cf68aa…

MALICIOUS

PDF

67.3 KB Created: 2020-11-30 00:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d743105d4caa7b829c2a7ef8a5c8a161 SHA-1: 8efea9ae2aa06204f265183069cd4b1f5ab07040 SHA-256: 180981d1c2cf68aa985ca302f4b3be116cbb63678e61545724b45f16087aa547
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Subscript out of range import excel to access'. The presence of numerous external PDF links, some pointing to potentially benign sources and others to unknown or malicious ones, indicates a link farm or redirection strategy. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffmen.ru/123?utm_term=subscript+out+of+range+import+excel+to+access In PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/vibis.pdfIn PDF document text
    • https://pobonagodin.weebly.com/uploads/1/3/4/7/134756685/ff04a2eb18b2651.pdfIn PDF document text
    • https://gigijelu.weebly.com/uploads/1/3/4/8/134850334/fudufa-jodiwawu-sapidigogo-xogerefejuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fe0b93-f83e-4300-85a3-073bd0e8f004/jawubamijufuwuzun.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/2440985733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84a761e-57ce-47a7-b49b-d8e974620454/wapakosabekogevazofop.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/sujukoginokivaregevasenob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe30691a-1abe-4361-8d94-664c9558dd34/88133846453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702bf98c-6cef-4085-a3d0-432bf100ed53/sierra_bullets_reloading_data.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/23606889762.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/melugumunipejotixabo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 5644 bytes
SHA-256: 0056e0116b208f7a70085a460400d1f9fd9551c2eb05914f242ff91bac86ffbf
font_01_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 10832 bytes
SHA-256: 5fb83e22d23be06023bb61a79baa26fa91b27d88df16ab054b15aa7059618167

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